FAQ: Conditional Operators - Logical NOT:!

#1

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This community-built FAQ covers the “Logical NOT: !” exercise from the lesson “Conditional Operators”.

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This exercise can be found in the following Codecademy content:

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FAQs on the exercise Logical NOT: !

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#2

Hey I have a question about this exercise. I do not get an error when I run the code as is:
I’ve highlighted at the bottom the part that confuses me. I should have to enter another instance variable correct? i.e. ‘boolean isConfirmed = false;’

But if I don’t include that, I get no error but the incorrect answer, right?

public class Reservation {
int guestCount;
int restaurantCapacity;
boolean isRestaurantOpen;
boolean isConfirmed;

public Reservation(int count, int capacity, boolean open) {
if (count < 1 || count > 8) {
System.out.println(“Invalid reservation!”);
}
guestCount = count;
restaurantCapacity = capacity;
isRestaurantOpen = open;
}

public void confirmReservation() {
if (restaurantCapacity >= guestCount && isRestaurantOpen) {
System.out.println(“Reservation confirmed”);
isConfirmed = true;
} else {
System.out.println(“Reservation denied”);
isConfirmed = false;
}
}

public void informUser() {
** // Write conditional here**

** if (!isConfirmed){**
** System.out.println(“Unable to confirm reservation, please contact restaurant.”);**
** } else {**
** System.out.println(“Please enjoy your meal!”);**
** }**

** }**

public static void main(String args) {
Reservation partyOfThree = new Reservation(3, 12, true);
Reservation partyOfFour = new Reservation(4, 3, true);
partyOfThree.confirmReservation();
partyOfThree.informUser();
partyOfFour.confirmReservation();
partyOfFour.informUser();
}
}

#3

Hello Tommy, the instructions were not clear for me as well, you don’t need to reassign any values to isConfirmed all they wanted is for you to create if else, without “!” operator. That’s what I’ve done
example:

if(isConfirmed == true) // just a simple if condition like on a previous exercise, try it out! 
{
    // do something 
} 
else 
{
  // do something in case if the first statement didn't get  implemented 
}

Hope this helps.

#4 
public class Reservation {
  int guestCount;
  int restaurantCapacity;
  boolean isRestaurantOpen;
  boolean isConfirmed;
  
  public Reservation(int count, int capacity, boolean open) {
    if (count < 1 || count > 8) {
      System.out.println("Invalid reservation!");
    }
    guestCount = count;
		restaurantCapacity = capacity;
		isRestaurantOpen = open;
  }  
  
  public void confirmReservation() {
    if (restaurantCapacity >= guestCount && isRestaurantOpen) {
      System.out.println("Reservation confirmed");
      isConfirmed = true;
    } else {
      System.out.println("Reservation denied");
			isConfirmed = false;
    }
  }
  
  public void informUser() {
    // Write conditional here
    if (!isConfirmed) {
      System.out.println("Unable to confirm reservation, please contact restaurant.");
    } else {
      System.out.println("Please enjoy your meal!");
    }

  }
  
  public static void main(String[] args) {
    Reservation partyOfThree = new Reservation(3, 12, true);
    Reservation partyOfFour = new Reservation(4, 3, true);
    partyOfThree.confirmReservation();
    partyOfThree.informUser();
    partyOfFour.confirmReservation();
    partyOfFour.informUser();
  }
}

with output:

Reservation confirmed
Please enjoy your meal!
Reservation denied
Unable to confirm reservation, please contact restaurant.